* {
    margin: 0px;
    padding: 0px;
    border: 0px;
}

div.banner {
    width: 700px;
    height: 420px;
    padding: 7px;
    position: relative;
    border: solid 1px gray;
}

.screen {
    width: 700px;
    height: 420px;
    overflow: hidden;
    position: relative;
}

.screen ul {
    position: absolute;
    top: 0px;
    width: 3500px;
}

.screen li {
    width: 700px;
    height: 420px;
    float: left;
    overflow: hidden;
}


img {
    height: 100%;
    width: 100%;
    z-index: 0;
}

.leftArr {
    cursor: pointer;
    width: 30px;
    height: 50px;
    position: absolute;
    top: 150px;
    left: 20px;
    background-color: rgba(0, 0, 0, 0.5);
    color: #fff;
    text-align: center;
    line-height: 50px;
}

.rightArr {
    cursor: pointer;
    width: 30px;
    height: 50px;
    position: absolute;
    top: 150px;
    right: 20px;
    background-color: rgba(0, 0, 0, 0.5);
    color: #fff;
    text-align: center;
    line-height: 50px;
}

.icon-dot {
    display: inline-block;
    width: 40px;
    height: 40px;
    background-color: #333;
    background-clip: content-box;
    padding: 8px;
    border-radius: 50%;
    border: 8px solid #333;
    z-index: 1000;
}

.dot {
    cursor: pointer;
    position: absolute;
    width: 93px;
    height: 30px;
    bottom: 7px;
    right: 300px;
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 15px;
}

.dot ul li {
    list-style: none;
    width: 15px;
    height: 15px;
    border-radius: 100%;
    background-color: #fff;
    float: left;
    margin: 7px 8px;
}

.dot ul li.active {
    transition: 0.5s;
    background-color: #fff;
    background-clip: content-box;
    padding: 2px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    border: 2px solid #Fff;
    margin: 5px 6px;
}

